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Apparatus for measurement of pitch and yaw damping derivatives in high Reynolds number blowdown wind tunnel

机译：用于测量高雷诺数排污风洞的俯仰和偏航阻尼导数的装置

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摘要

The pitch/yaw apparatus designed for the measurement of the moment derivative due to an aircraft or missile model angular oscillatory motion in a wind tunnel test section is presented. A model is forced to oscillate with the primary angular oscillation around its transversal axis (pitch or yaw). Damping derivatives are obtained as a difference between total damping measured in the presence of aerodynamic load and mechanical damping measured in the absence of aerodynamic load. The main requirements for a new apparatus were: high load capacity, high structural rigidity, high range of the experimental frequencies and high sensors sensitivity. The choice of the hydraulic drive is made considering these requirements. Amplitude of the excitation moment is measured either by internal wind tunnel balance or by a specially designed excitation moment sensor. The T-38 wind tunnel data for the Modified Basic Finner Model and Basic Finner Model obtained using the pitch/yaw apparatus are shown.
机译：提出了一种俯仰/偏航设备，其设计用于测量风洞测试部分中由于飞机或导弹模型的角振荡运动而引起的力矩导数。模型被迫围绕其横向轴（俯仰或偏航）以一次角振荡进行振荡。阻尼导数是在存在空气动力学负载的情况下测得的总阻尼与在没有空气动力学负载的情况下测得的机械阻尼之间的差值。对新设备的主要要求是：高负载能力，高结构刚度，大范围的实验频率和高传感器灵敏度。液压驱动的选择要考虑到这些要求。通过内部风洞平衡或通过专门设计的激励力矩传感器来测量激励力矩的幅度。显示了使用俯仰/偏航设备获得的修改后的基本Finner模型和Basic Finner模型的T-38风洞数据。

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